Sensorimotor enhancement in mouse mutants lacking the Purkinje cell-specific Gi/o modulator, Pcp2(L7).
Pcp2(L7) is a GoLoco domain protein specifically and abundantly expressed in cerebellar Purkinje cells. It has been hypothesized to "tune" G(i/o)-coupled receptor modulation of physiological effectors, including the P-type Ca(2+) channel. We have analyzed a mouse mutant in which the Pcp2(L7) gene was inactivated and find significant anatomical, behavioral and electrophysiological changes. Anatomically, we observed mild cerebellar hypoplasia. Behaviorally, the mutants were altered in modalities atypical for a traditional cerebellar mutant, and oddly, all of these changes could be considered functional enhancements. This includes increased asymptotic performance in gross motor learning, increased rate of acquisition in tone-conditioned fear, and enhanced pre-pulse inhibition of the acoustic startle response. Electrophysiological analysis of Purkinje cells in the mutants reveals depression of the complex spike waveform that may underlie the behavioral changes. Based on these observations we suggest that the Pcp2(L7) protein acts as a sensorimotor damper that modulates time- and sense-dependent changes in motor responses.
Iscru
Emilia
E
Center for Molecular Neurobiology, The Ohio State University, Columbus, OH, USA.
Serinagaoglu
Yelda
Y
Schilling
Karl
K
Tian
Jinbin
J
Bowers-Kidder
Stephanie L
SL
Zhang
Rui
R
Morgan
James I
JI
DeVries
A Courtney
AC
Nelson
Randy J
RJ
Zhu
Michael X
MX
Oberdick
John
J
D000200:Action Potentials / Q000502:physiology; D000818:Animals; D001522:Behavior, Animal / Q000502:physiology; D002531:Cerebellum / Q000002:abnormalities / Q000166:cytology* / Q000378:metabolism; D005260:Female; D019206:GTP-Binding Protein alpha Subunits, Gi-Go / Q000235:genetics / Q000378:metabolism*; D020868:Gene Silencing; D020662:Guanine Nucleotide Exchange Factors / Q000235:genetics / Q000378:metabolism*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D009043:Motor Activity / Q000502:physiology; D009479:Neuropeptides / Q000235:genetics / Q000378:metabolism*; D011689:Purkinje Cells / Q000166:cytology / Q000378:metabolism*
D020662:Guanine Nucleotide Exchange Factors; D009479:Neuropeptides; C104971:Pcp2 protein, mouse; D019206:GTP-Binding Protein alpha Subunits, Gi-Go